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一、填空题
1. $-\dfrac{2}{3} × \dfrac{9}{4} =$
2. $3\dfrac{1}{3} × (-0.12) =$
3. $(+18) ÷ (-6) =$
4. $\dfrac{1}{7} ÷ (-7) =$
5. $(-\dfrac{3}{7}) ÷ (-\dfrac{3}{35}) =$
6. $(-3) × (-4) × (-5) =$
7. $(-3) ÷ (-1\dfrac{3}{4}) × 0.75 =$
8. $(-81) × (-\dfrac{4}{9}) ÷ (+2\dfrac{1}{4}) =$
1. $-\dfrac{2}{3} × \dfrac{9}{4} =$
$-\dfrac{3}{2}$
2. $3\dfrac{1}{3} × (-0.12) =$
$-\dfrac{2}{5}$
3. $(+18) ÷ (-6) =$
$-3$
4. $\dfrac{1}{7} ÷ (-7) =$
$-\dfrac{1}{49}$
5. $(-\dfrac{3}{7}) ÷ (-\dfrac{3}{35}) =$
$5$
6. $(-3) × (-4) × (-5) =$
$-60$
7. $(-3) ÷ (-1\dfrac{3}{4}) × 0.75 =$
$\dfrac{9}{7}$
8. $(-81) × (-\dfrac{4}{9}) ÷ (+2\dfrac{1}{4}) =$
$16$
答案
1. $-\dfrac{3}{2}$
2. $-\dfrac{2}{5}$
3. $-3$
4. $-\dfrac{1}{49}$
5. $5$
6. $-60$
7. $\dfrac{9}{7}$
8. $16$
2. $-\dfrac{2}{5}$
3. $-3$
4. $-\dfrac{1}{49}$
5. $5$
6. $-60$
7. $\dfrac{9}{7}$
8. $16$
二、计算题
9. $(-15)×(-17)×(-1001)×0$
10. $(-\frac{1}{6}-\frac{3}{20}+\frac{4}{5}-\frac{7}{12})×(-60)$
11. $(-0.25)×(-\frac{4}{7})×4×(-7)$
12. $(-45)÷[(-\frac{1}{3})÷(-\frac{2}{5})]$
13. $|-5.2|×\left|-3\frac{1}{2}\right|×(-10)÷\frac{13}{4}×(-\frac{5}{14})$
14. $-150×(-\frac{1}{8})+50×(-\frac{1}{4})-25×0.125$
15. 易错题 $-1\frac{1}{2}÷\frac{3}{4}×(-0.2)×1\frac{3}{4}÷1.4×(-\frac{3}{5})$
9. $(-15)×(-17)×(-1001)×0$
10. $(-\frac{1}{6}-\frac{3}{20}+\frac{4}{5}-\frac{7}{12})×(-60)$
11. $(-0.25)×(-\frac{4}{7})×4×(-7)$
12. $(-45)÷[(-\frac{1}{3})÷(-\frac{2}{5})]$
13. $|-5.2|×\left|-3\frac{1}{2}\right|×(-10)÷\frac{13}{4}×(-\frac{5}{14})$
14. $-150×(-\frac{1}{8})+50×(-\frac{1}{4})-25×0.125$
15. 易错题 $-1\frac{1}{2}÷\frac{3}{4}×(-0.2)×1\frac{3}{4}÷1.4×(-\frac{3}{5})$
答案
9. $0$
10. $6$
11. $-4$
12. $-54$
13. $20$
14. $\dfrac{25}{8}$
15. $-\dfrac{3}{10}$
15. 本题易因未把小数化成分数,从而导致计算出错.同时也易因错数负号个数,导致结果符号错误.
10. $6$
11. $-4$
12. $-54$
13. $20$
14. $\dfrac{25}{8}$
15. $-\dfrac{3}{10}$
15. 本题易因未把小数化成分数,从而导致计算出错.同时也易因错数负号个数,导致结果符号错误.
